This pictured watch has different dial markers, so I'm not sure if the cases are identical but the dials may be the difference. The crystal package states for variants F G H, which have not been identified as of yet. I also have a Rocket Cylinder SUC that references a 21.8 x 19.4 crystal model RMS 129-78 for the Rawlings A B C D variants. I have one of the SUC crystals and can find it to reference. I also have the GS on hand. The ad in the listing above is for a $71.95 model, which is stated as the F G H I variants in the 1964 pricelist; the $75 models according to the 1961 & 1964 pricelists were designated as variants A B C D

I would say if you have a white dial with 3 9 12 markers, you may be looking at it being either the F or G variant, which would likely use the GS CMX325-17E (the dimensions from one crystal manufacturer to another are not always the same, and possibly either crystal I mentioned will fit all of the variants)